Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomol00smit Year: 1906 THE INSECT 191 Fig. 176. flies ' are first noticed in June in the more northern and central portions of tlie United States, and have the terminal segments of the abdomen on the under side of a bright sulphur-yellow color, which at the will of tlie insect glows with a phosphorescent light of considerable illuminating power. They hide during the day on the foliage of plants or in crevices, and begin
Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomol00smit Year: 1906 THE INSECT 191 Fig. 176. flies ' are first noticed in June in the more northern and central portions of tlie United States, and have the terminal segments of the abdomen on the under side of a bright sulphur-yellow color, which at the will of tlie insect glows with a phosphorescent light of considerable illuminating power. They hide during the day on the foliage of plants or in crevices, and begin their flight with the deepening of the twilight. In some species the female is without wings and remains on the ground among the grass— the 'glow-worm.' The larva- are predaccous, and some of them live on snails. Belonging to the same family, but of a diurnal habit and with- out the illuminating power, are the 'soldier-beetles,' belonging to the genera Chaiiliogna- thus and Tclcphonis, dis- tinguished also by having a more prominent head and large, round eyes. These may be found on flowers, where they prob- ably feed on pollen, but are of direct benefit by aiding in pollination. The larvae are even more de- cidedly useful, being predaceous and feeding largely on soft- bodied grubs and the like. They are long and slender, flattened above and somewhat narrowed at each end, or fusiform, the edges of the segments quite prominently marked. They are especially effective against such creatures as the larvae of the plum curculio when they enter the ground to pupate, and a large pro- portion are thus disposed of annual!}-. The species belonging to the family Malachiid(£ resemble the Lampyrids in the soft body texture and leathery wing-covers, but they are much shorter and broader, the broadest part of the body coming near the end of the wing-covers. The antennae are short, a little enlarged at the tip, and often curiously knotted in the male. Many of the species have soft, orange- c
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